Question

Find x in the following case:

Answer 1

In the figure,

∵ Lines are parallel

∴ 4x + 1 = 180° .........(co-interior angles)

But ∠1 = 5x ........(vertically opposite angles)

∴ 4x + 5x = 180°

⇒ 9x = 180°

Hence x =`(180°)/9` = 20°